Use a service manual if you need to do more than change oil and/or filters.
AN400K3 Service Manual part number is 99500-34080-03E .
The following images May Not Be At Scale.
Below is the little O-Ring that gets slipped down the tube (flush against the bottom) that the filter then slides onto.
Unless my 400 Burgy filter chamber is left open to the elements I do not
clean the mating surfaces inside the tube prior to placing the new o-ring
down to the bottom.
________________
Below is the filter element itself.
My AN400K3 owners book states to be careful not to reverse the install
of the filter onto the tube but the latest revision (16510-25C00) of the filter makes it
impossible to do so.
________________
Below is the O-Ring that is on the inside of the oil filter element cover.
I've been able to clean the cover and flange face to save a cover gasket
once or twice. Look for growth of oil and dirt around the seal after running
the bike again (at high speed) to determine if the next change requires
better cleaning and/or new gasket.
Always apply oil sheen to all mating sides of an o-ring gasket after cleaning
mating surfaces.
To complete, torque all three bolts of the cover only snugly back down and don't over do it.
The cover gasket is doing the sealing here not excessive bolt torque.
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-
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AN400K3 Service Manual part number is 99500-34080-03E .

The following images May Not Be At Scale.
Below is the little O-Ring that gets slipped down the tube (flush against the bottom) that the filter then slides onto.
Unless my 400 Burgy filter chamber is left open to the elements I do not
clean the mating surfaces inside the tube prior to placing the new o-ring
down to the bottom.

________________
Below is the filter element itself.
My AN400K3 owners book states to be careful not to reverse the install
of the filter onto the tube but the latest revision (16510-25C00) of the filter makes it
impossible to do so.

________________
Below is the O-Ring that is on the inside of the oil filter element cover.
I've been able to clean the cover and flange face to save a cover gasket
once or twice. Look for growth of oil and dirt around the seal after running
the bike again (at high speed) to determine if the next change requires
better cleaning and/or new gasket.
Always apply oil sheen to all mating sides of an o-ring gasket after cleaning
mating surfaces.
To complete, torque all three bolts of the cover only snugly back down and don't over do it.
The cover gasket is doing the sealing here not excessive bolt torque.

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-
-